AMPLEX Ankle Fusion and Hindfoot

Inclusion Criteria: * Signed written informed consent * Indicated for ankle or hindfoot arthrodesis and require one of the following arthrodesis procedures: Tibiotalar (ankle); Talocalcaneal (subtalar); Talonavicular; Calcaneocuboid; Double hindfoot (e.g., talonavicular and talocalcaneal joints); Triple hindfoot (subtalar, talonavicular and calcaneocuboid joints) * Presents with pain on weight-bearing of at least 40 mm on a 100 mm VAS at the area indicated for arthrodesis * Presents with at least one comorbid risk factors that warrant the use of supplemental autogenous bone or allograft: Radiographic evidence of bone defect, deficit, subsidence or subchondral cyst; More than one joint to be fused; Involvement of other adjacent or nonadjacent joints; Large surface area; Intra-articular or extra-articular deformity; Post-traumatic arthritis; Diagnosis of osteoporosis * The Investigator determines if the joint space(s) can be adequately filled with graft material (AMPLEX or ABG) according to the following parameters: Single hindfoot joint fusion: up to 5 cm\^3; Double or triple hindfoot fusion: each individual joint up to 5 cm\^3, but overall, not more than 10 cm3 for the full complement of joints; Ankle fusion: up to 10 cm\^3 * Each fused joint can be rigidly stabilized with with at least 1 and no more than 3 screws across the fusion plane. (Supplemental pins and staples may be used, as well as supplemental screws and plates external to the fusion site(s)) * Willing and …